Ethical issues and pervasive computing

There is a growing concern both publicly and professionally surrounding the implementation of Information and Communication Technologies (ICT) and their social and ethical impact. As these technologies become increasingly pervasive and less visible to the user, there is a greater need for professionals to address the concerns in order to regain public trust and maximise the benefits that these technologies can bring. This chapter explores the ethical aspects of the world of pervasive computing and shows the need for an ethical perspective when considering the design and implementation of complex, integrated, multiple systems. We present the background to ethics and technology to give the foundation for our discussion, and refer to current research and ethical principles to provide the argument for ethical consideration. Finally, codes of professional conduct provide the standards, and endorsement, for professional responsibility

Input-output relations for a 3-port grating coupled Fabry-Perot cavity

We analyze an optical 3-port reflection grating by means of a scattering matrix formalism. Amplitude and phase relations between the 3 ports, i.e. the 3 orders of diffraction are derived. Such a grating can be used as an all-reflective, low-loss coupler to Fabry-Perot cavities. We derive the input output relations of a 3-port grating coupled cavity and find distinct properties not present in 2-port coupled cavities. The cavity relations further reveal that the 3-port coupler can be designed such that the additional cavity port interferes destructively. In this case the all-reflective, low-loss, single-ended Fabry-Perot cavity becomes equivalent to a standard transmissive, 2-port coupled cavity

Three-port beam splitters-combiners for interferometer applications

We derive generic phase and amplitude coupling relations for beam splitters-combiners that couple a single port with three output ports or input ports, respectively. We apply the coupling relations to a reflection grating that serves as a coupler to a single-ended Fabry-Perot ring cavity. In the impedance-matched case such an interferometer can act as an all-reflective ring mode cleaner. It is further shown that in the highly undercoupled case almost complete separation of carrier power and phase signal from a cavity strain can be achieved

Events, Context, and Situations and Reactive Mobile Service Delivery

Mobile Users (MUs) require flexible, reactive service delivery due to their regularly changing location and activities and the lack of a wired Internet connection. A mobile service delivery system should be able to detect relevant events that occur such as change of location, availability of new last-minute specials, sales opportunities and safety issues and then reactively take action in response to these events. This paper describes a framework for delivering such a system. Issues addressed include MU and service states and events, context, situations and situation-action rules, and syntactically and semantically compatible XML schemas for their specification. A framework is proposed that is based on distributed, co-operating software agents and mobile data technologies

Skeuomorphic reassurance : personhood and dementia

This paper introduces the concept of ‘skeomorphic reassurance’ as a guiding principle for human interfaces in technological development and design, particularly for older people and people with dementia (PwD). Skeuomorphs exhibit decorative design elements reminiscent of ‘parent’ objects that incorporated such design elements because they were structurally integral. Human interfaces adopted by new technologies need to be carefully balanced between novelty and recognisability. The philosophy of personhood is discussed in the context of dementia, concluding that the subjective character of conscious mental processes is an irreducible feature of reality, and that the persistence of personhood in PwD constitutes a further argument in support of this assertion. Assistive technologies that aid family and carers, as well as PwD, and their relationships, need to ensure that skeuomorphic reassurance is incorporated in their design, not least because older people and PwD need recognisable interfaces today, but, as this paper argues, because the problems today’s over-65s have with digital technologies may quite likely not go away, but re-present themselves generation after generation, unless skeuomorphic reassurance is built into their design

A Design Construct of Developing Approaches to Measure Mental Health Conditions

Mental health is an important determinant of communities’ well-being, influenced not only by individual attributes, but also by social and organisational environments in which people work and live. Despite studies examining mental health status among specific populations, few attempts are evident that focus on solution designs for detecting and measuring impact of mental health conditions. In this study, we develop a construct utilising design science research principles for outlining common vocabulary around the problem, and solution design relevant to a mental health management system. For the case of IT professionals, the developed construct is informed through a social-media based dataset containing more than 65,000 cells and 100 attributes potentially identifying influencing factors. Machine learning techniques are applied to the dataset to discover new findings for this specific group. It is anticipated that the analysis reported in this study would contribute in developing other electronic health management systems both for communities and healthcare professionals

Demonstration of 3-port grating phase relations

We experimentally demonstrate the phase relations of 3-port gratings by investigating 3-port coupled Fabry-Perot cavities. Two different gratings which have the same 1st order diffraction efficiency but differ substantially in their 2nd order diffraction efficiency have been designed and manufactured. Using the gratings as couplers to Fabry-Perot cavities we could validate the results of an earlier theoretical description of the phases at a three port grating

Diffractive Optics for Gravitational Wave Detectors

All-reflective interferometry based on nano-structured diffraction gratings offers new possibilities for gravitational wave detection. We investigate an all-reflective Fabry-Perot interferometer concept in 2nd order Littrow mount. The input-output relations for such a resonator are derived treating the grating coupler by means of a scattering matrix formalism. A low loss dielectric reflection grating has been designed and manufactured to test the properties of such a grating cavity

High reflectivity grating waveguide coatings for 1064nm

We propose thin single-layer grating waveguide structures to be used as high-reflectivity, but low thermal noise, alternative to conventional coatings for gravitational wave detector test mass mirrors. Grating waveguide (GWG) coatings can show a reflectivity of up to 100% with an overall thickness of less than a wavelength. We theoretically investigate GWG coatings for 1064nm based on tantala (Ta2O5) on a Silica substrate focussing on broad spectral response and low thickness

Experimental demonstration of a suspended diffractively coupled optical cavity

All-reflective optical systems are under consideration for future gravitational wave detector topologies. One approach in proposed designs is to use diffraction gratings as input couplers for Fabry–Perot cavities. We present an experimental demonstration of a fully suspended diffractively coupled cavity and investigate the use of conventional Pound–Drever–Hall length sensing and control techniques to maintain the required operating condition